<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport"
        content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>姓名案例_计算属性实现</title>
    <!-- 引入Vue -->
    <script src="../js/vue.js" type="text/javascript" charset="utf-8"></script>
</head>

<body>
    <!-- 准备一个容器 -->
    <div id="root">
        姓：<input type="text" v-model="firstName"><br /><br />
        名：<input type="text" v-model="lastName"><br /><br />
        全名：<span>{{fullName}}</span>
    </div>

</body>
<script type="text/javascript">
    Vue.config.productionTip = false;  // 阻止 vue 在启动时生成生产提示。

    // 创建Vue实例
    const vm = new Vue({
        el: '#root',
        data: {
            firstName: '张',
            lastName: '三'
        },

        // 完整写法
        /* computed: {
            fullName:{
                get(){
                    console.log('get被调用了');
                    return this.firstName + '-' + this.lastName
                },
                set(value){
                    console.log('set',value);
                    const arr = value.split('-');
                    this.firstName = arr[0];
                    this.lastName = arr[1];
                }
            }
            } */

        //简写
        computed: {
            fullName() {
                console.log('get被调用了');
                return this.firstName + '-' + this.lastName
            }
        }
    })
</script>

</html>